Battery cutoff unit, battery pack, and vehicle

Abstract

The utility model provides a battery cut-off unit, a battery pack and a vehicle. The battery cut-off unit comprises a relay shell, a relay body and a liquid cooling structure, the relay body is contained in the relay shell, a containing gap is formed between the relay shell and the relay body, the liquid cooling structure is contained in the containing gap, cooling liquid is arranged in the liquid cooling structure, and the liquid cooling structure is used for being in contact with the relay body for heat exchange. The liquid cooling structure for directly cooling the relay body is arranged in the relay shell, the relay body can be cooled without a liquid cooling system in the battery pack or the battery cut-off unit, the heat dissipation structure in the battery cut-off unit is simple, the liquid cooling structure is directly integrated in the relay shell, and the heat dissipation efficiency is improved. Other space in the battery cut-off unit is not additionally occupied, the overall size of the battery cut-off unit is guaranteed, and the problems that a heat dissipation structure in the battery cut-off unit is complex, the overall size is too large, and the battery cut-off unit cannot adapt to the installation space in a battery pack are solved.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a battery disconnection unit, a battery pack and a vehicle. Background Art

[0002] The battery pack is equipped with a battery disconnect unit (BDU), which includes high-voltage devices such as high-voltage DC relays. The relays are used to control the on / off of the entire high-voltage system. At present, new energy vehicles are developing in the direction of large power and high-rate fast charging. The problem brought about by this is that the charging current increases sharply, which easily affects the heat dissipation of the vehicle's high-voltage system. Especially when the high-voltage DC relay carries a large current, the large amount of heat accumulated inside it cannot be dissipated in time, which easily causes safety accidents such as thermal runaway.

[0003] However, in the prior art, the heat dissipation of the relay is usually dissipated by means of a liquid cooling system in a battery pack or a BDU. This solution results in a complex heat dissipation structure inside the BDU and an overall size that is too large, and cannot fit into the installation space inside the battery pack. Utility Model Content

[0004] In order to solve the above technical problems, the present disclosure provides a battery disconnection unit, a battery pack and a vehicle.

[0005] A first aspect of the present disclosure provides a battery disconnection unit, comprising a relay housing, a relay body and a liquid cooling structure, wherein the relay body is accommodated in the relay housing, an accommodation gap is formed between the relay housing and the relay body, the liquid cooling structure is accommodated in the accommodation gap, a coolant is provided in the liquid cooling structure, and the liquid cooling structure is used for contact and heat exchange with the relay body.

[0006] Optionally, the liquid cooling structure is wound around and attached to the outer peripheral wall of the relay body to exchange heat with the outer peripheral wall of the relay body.

[0007] Optionally, the liquid cooling structure is a liquid cooling tube, and the liquid cooling tube is arranged to bend and extend in a stacked manner along the outer peripheral wall of the relay body.

[0008] Optionally, two ends of the liquid cooling pipe are formed as a water inlet interface and a water outlet interface, and the water inlet interface and the water outlet interface pass through the relay housing to extend out.

[0009] Optionally, the liquid cooling tube is in a flat tube shape; and / or the liquid cooling tube is made of metal.

[0010] Optionally, the relay body includes an arc extinguishing chamber and relay contacts arranged on the top of the arc extinguishing chamber, and the liquid cooling structure is wound around and attached to the outer peripheral wall of the arc extinguishing chamber.

[0011] Optionally, the liquid cooling structure is fixed to the outer peripheral wall of the arc extinguishing chamber by means of a heat-conductive structural adhesive.

[0012] Optionally, a magnetic component for magnetically blowing out arcs is provided on an outer wall of the arc extinguishing chamber, and the liquid cooling structure is in contact with the magnetic component for heat exchange.

[0013] A second aspect of the present disclosure provides a battery pack, comprising the battery disconnection unit as described above.

[0014] A third aspect of the present disclosure provides a vehicle, comprising the battery pack as described above.

[0015] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0016] The battery disconnect unit provided by the present invention comprises a relay housing, a relay body and a liquid cooling structure. An accommodation gap is formed between the relay housing and the relay body, and the liquid cooling structure is accommodated in the accommodation gap. A coolant is arranged in the liquid cooling structure, so that the liquid cooling structure can directly contact with the relay body for heat exchange, thereby realizing that the relay housing has a liquid cooling structure for directly dissipating the heat of the relay body, and there is no need to rely on the liquid cooling system in the battery pack or the battery disconnect unit to dissipate the heat of the relay body, so that the heat dissipation structure inside the battery disconnect unit is simple, and the liquid cooling structure is directly integrated and arranged inside the relay housing, and does not occupy other space in the battery disconnect unit, thereby ensuring the overall size of the battery disconnect unit, and solving the problem that the heat dissipation structure inside the battery disconnect unit is complex and the overall size is too large to fit the installation space inside the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a schematic structural diagram of a battery disconnection unit in an embodiment of the present disclosure;

[0020] Figure 2 The figure is a schematic diagram of the internal structure of a battery disconnection unit in an embodiment of the present disclosure.

[0021] Reference numerals:

[0022] 1. Relay housing; 10. Accommodation gap; 11. Connection hole; 2. Relay body; 21. Arc extinguishing chamber; 22. Relay contacts; 23. Magnetic parts; 3. Liquid cooling structure; 31. Water inlet interface; 32. Water outlet interface. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0025] Reference Figure 1 and Figure 2 As shown, some embodiments of the present disclosure provide a battery disconnection unit, including a relay housing 1 , a relay body 2 and a liquid cooling structure 3 .

[0026] Specifically, the relay body 2 is accommodated in the relay housing 1, and an accommodation gap 10 is formed between the relay housing 1 and the relay body 2. The liquid cooling structure 3 is accommodated in the accommodation gap 10, and coolant is provided in the liquid cooling structure 3. The liquid cooling structure 3 is used for contact and heat exchange with the relay body 2.

[0027] The battery disconnect unit provided by the present invention forms a receiving gap 10 between the relay housing 1 and the relay body 2, and accommodates the liquid cooling structure 3 in the receiving gap 10, so that the liquid cooling structure 3 can directly contact the relay body 2 for rapid heat exchange, thereby realizing that the relay housing 1 has a liquid cooling structure 3 for directly dissipating heat to the relay body 2, and there is no need to rely on the liquid cooling system in the battery pack or the battery disconnect unit to dissipate heat to the relay body 2, so that the heat dissipation structure inside the battery disconnect unit is simple, and the liquid cooling structure 3 is directly integrated inside the relay housing 1, and does not occupy other space in the battery disconnect unit, thereby ensuring the overall size of the battery disconnect unit, and solving the problem that the heat dissipation structure inside the battery disconnect unit is complex and the overall size is too large to fit the installation space inside the battery pack.

[0028] In some embodiments, the liquid cooling structure 3 is wound around and attached to the outer wall of the relay body 2, thereby exchanging heat with the outer wall of the relay body 2 in contact, so that the heat conduction path of the relay body 2 is shorter, and a large amount of heat generated during the operation of the relay body 2 can be quickly dissipated through the liquid cooling structure 3 attached thereto in a timely manner. In addition, the liquid cooling structure 3 is wound around and attached to the outer wall of the relay body 2, which can also reduce the volume of the liquid cooling structure 3 itself and make full use of the narrow space of the accommodating gap 10.

[0029] It should be noted that, in actual application, the liquid cooling structure 3 can be a stamped liquid cooling structure or a tubular liquid cooling structure, for example, a liquid cooling tube, a stamped cold plate or an extruded profile cold plate, as long as it can dissipate heat for the relay body 2 while ensuring that the liquid cooling structure 3 can be accommodated in the accommodating gap 10.

[0030] In some embodiments, reference Figure 2 As shown, the liquid cooling structure 3 is a liquid cooling tube, which is arranged in a stacked, bent and extended manner along the outer peripheral wall of the relay body 2. This effectively realizes the comprehensive cooling of the relay body 2 and achieves the effect of uniform coolant temperature. Specifically, in the actual application process, it can be a whole liquid cooling tube, which is spirally stacked on the outer peripheral wall of the relay body 2, or reciprocatingly wound on the outer peripheral wall of the relay body 2. It can also be a plurality of liquid cooling tubes, all of which are bent and wound around the outer peripheral wall of the relay body 2, and can be flexibly arranged according to actual use requirements.

[0031] Furthermore, the two ends of the liquid cooling pipe are formed as a water inlet interface 31 and a water outlet interface 32, and the water inlet interface 31 and the water outlet interface 32 pass through the relay housing 1 to extend. And the water inlet interface 31 and the water outlet interface 32 are both located on the same side of the relay body 2, so that the coolant can flow fully along the outer peripheral wall of the relay body 2 along the length direction of the liquid cooling pipe, thereby accelerating the heat dissipation efficiency of the liquid cooling pipe and the relay body 2. In the actual application process, the liquid cooling pipe can be connected to the liquid cooling system of the battery pack, and can also be connected to the liquid cooling system of the battery cut-off unit, and the connection method can be parallel or series. It should be noted that the specific shape and number of the liquid cooling pipe can be flexibly set according to the specific structure of the relay body 2 or the liquid cooling demand. In addition, the type of coolant is not limited in principle, as long as the cooling of the relay body 2 can be achieved. Exemplarily, the coolant can be cooling water, etc.

[0032] Furthermore, in order to ensure that the liquid cooling tube can be used normally and does not affect the size of the relay housing 1 and the relay body 2, the liquid cooling tube is in the shape of a flat tube as a whole, that is, the thickness of the liquid cooling tube is relatively small, so that the liquid cooling tube will not collide with the relay housing 1 during use. And the side of the liquid cooling tube with a larger size is attached to the outer peripheral wall of the relay body 2, which increases the contact area between the liquid cooling tube and the relay body 2 and ensures the heat dissipation effect. In addition, the liquid cooling tube of this structure has a better current carrying capacity, a smaller size, and a lower cost. In actual application, the liquid cooling tube can be made of metal material, which can ensure the service life of the liquid cooling tube. The metal material can also increase the heat conduction speed of the liquid cooling tube to a certain extent, which can effectively improve the cooling capacity of the battery cut-off unit and meet the market demand for high-power fast charging.

[0033] In some embodiments, reference Figure 2 As shown, the relay body 2 includes an arc extinguishing chamber 21 and a relay contact 22 arranged on the top of the arc extinguishing chamber 21. When the relay body 2 is in operation, the process of the two contacts connecting and disconnecting the current is often accompanied by the generation and extinction of an arc. The arc is a gas discharge phenomenon, which has certain hazards to the relay body 2. The arc can be effectively extinguished on the relay body 2 through the arc extinguishing chamber 21. Since a large current usually passes through this part of the structure during the operation of the relay body 2, the heat is relatively high. The liquid cooling structure 3 is wound around and attached to the outer wall of the arc extinguishing chamber 21, which can effectively dissipate the heat of the arc extinguishing chamber 21 and the relay body 2.

[0034] Specifically, the liquid cooling structure 3 is fixed to the outer wall of the arc extinguishing chamber 21 by means of a heat-conducting structural adhesive, ensuring a stable connection between the liquid cooling structure 3 and the arc extinguishing chamber 21, so that the liquid cooling structure 3 and the relay body 2 can form a whole, thereby improving the integration and structural rigidity of the relay body 2 to a certain extent, thereby improving the mechanical strength and service life of the battery disconnection unit. In actual application, the liquid cooling structure 3 can also be fixed to the outer wall of the arc extinguishing chamber 21 by other means, such as snap-on, screw-on, etc., and the fixing form is not limited.

[0035] In addition, in the existing structure, the relay body 2 is cooled by the liquid cooling system in the battery pack or the battery disconnection unit. Since the relay body 2 needs to be connected to an external copper busbar during use, the heat transfer path of the relay body 2 is too long, resulting in a low heat dissipation efficiency of the relay body 2. At the same time, since the air between the copper busbars is prone to condensation in an alternating hot and cold environment, this phenomenon will cause the insulation of the high-voltage system to decrease, and even cause serious failure risks such as short circuits. Because the liquid cooling structure 3 is wound around and attached to the outer peripheral wall of the arc extinguishing chamber 21, and the arc extinguishing chamber 21 itself can be sealed by brazing, the arc extinguishing chamber 21 itself has extremely strong sealing performance. Therefore, even if condensation occurs on the outside of the liquid cooling structure 3, it will not affect the insulation of the relay body 2 itself, ensuring the safety and reliability of the relay body 2.

[0036] Furthermore, a magnetic part 23 for magnetically blowing out the arc is provided on the outer wall of the arc extinguishing chamber 21, and the magnetic part 23 can be provided on both sides of the arc extinguishing chamber 21, or on the four side walls of the arc extinguishing chamber 21. The magnetic part 23 can be a permanent magnet, and the magnetism of the permanent magnet tends to weaken or even disappear under high temperature conditions, which will cause the arc extinguishing performance of the relay body 2 to weaken, or even fail, and in severe cases, cause the relay body 2 to burst. The liquid cooling structure 3 is brought into contact with the permanent magnet to exchange heat with the permanent magnet, which can better control the temperature of the permanent magnet, so that its temperature is always in a comfortable range, thereby ensuring that the permanent magnet can always maintain a strong magnetic force, thereby indirectly improving the arc extinguishing ability of the relay body 2.

[0037] In some embodiments, the battery disconnection unit further comprises a housing portion for accommodating the relay and other components of the battery disconnection unit. A connection hole is provided on the relay housing 1, and the relay housing 1 is fixed to the housing portion by fasteners passing through the connection hole and the housing portion.

[0038] The present disclosure also provides a battery pack, including the battery disconnection unit as described above. The liquid cooling structure 3 is accommodated in the accommodation gap 10 between the relay housing 1 and the relay body 2, so that the liquid cooling structure 3 can directly contact the relay body 2 for rapid heat exchange, and there is no need to use the liquid cooling system in the battery pack or the battery disconnection unit to dissipate heat from the relay body 2, so that the liquid cooling structure 3 is directly integrated inside the relay housing 1, and does not occupy additional space in the battery disconnection unit, thereby ensuring the overall size of the battery disconnection unit, which will not be described in detail here.

[0039] The present disclosure also provides a vehicle, including a battery pack as described above. Exemplarily, the vehicle is an electric vehicle or a hybrid vehicle, and the battery pack is installed on the bottom surface of the vehicle body. The technical features of the battery pack used in the vehicle can be found in the battery pack in the above embodiment, and will not be described here one by one. It should be noted that the battery pack provided by the present disclosure can be used not only in vehicles, but also in ships or other mechanical devices.

[0040] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0041] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery disconnection unit, characterized in that: It includes a relay housing, a relay body and a liquid cooling structure, wherein the relay body is accommodated in the relay housing, an accommodating gap is formed between the relay housing and the relay body, the liquid cooling structure is accommodated in the accommodating gap, a coolant is arranged in the liquid cooling structure, and the liquid cooling structure is used for contact and heat exchange with the relay body.

2. The battery disconnect unit according to claim 1, characterized in that: The liquid cooling structure is wound around and attached to the outer peripheral wall of the relay body so as to be in contact with the outer peripheral wall of the relay body for heat exchange.

3. The battery disconnect unit according to claim 1, characterized in that: The liquid cooling structure is a liquid cooling tube, and the liquid cooling tube is arranged along the outer peripheral wall of the relay body in a stacked, bent and extended manner.

4. The battery disconnection unit according to claim 3, characterized in that: Two ends of the liquid cooling pipe are formed as a water inlet interface and a water outlet interface, and the water inlet interface and the water outlet interface pass through the relay housing to extend out.

5. The battery disconnection unit according to claim 3, characterized in that: The liquid cooling tube is in a flat tube shape; and / or the liquid cooling tube is made of metal.

6. The battery disconnection unit according to claim 1, characterized in that: The relay body comprises an arc extinguishing chamber and relay contacts arranged on the top of the arc extinguishing chamber, and the liquid cooling structure is wound around and attached to the outer peripheral wall of the arc extinguishing chamber.

7. The battery disconnect unit according to claim 6, characterized in that: The liquid cooling structure is fixed on the outer peripheral wall of the arc extinguishing chamber by means of a heat-conducting structural adhesive.

8. The battery disconnection unit according to claim 6, characterized in that: A magnetic component for magnetically blowing out arcs is arranged on the outer wall of the arc extinguishing chamber, and the liquid cooling structure is in contact with the magnetic component for heat exchange.

9. A battery pack, characterized in that: The invention comprises a battery disconnection unit as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

Images